{"id":"CVE-2026-119855","kind":"vulnerability","aliases":["CVE-2026-119855"],"related":[],"title":"Windows COM+ Event System: local buffer over-read leaks memory contents","description":"Buffer over-read in Windows COM+ Event System Service allows an authorized attacker to disclose information locally.","summary":"A buffer over-read in the Windows COM+ Event System Service lets an authorized local user read memory beyond the intended buffer. The attacker gets information disclosure only, with no code execution stated in the sources.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["com+","infrastructure","windows"],"not_affected_if":["no-local-accounts"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:03+00:00","first_seen_at":"2026-11-10T19:24:59+00:00","triaged_at":"2026-11-10T20:00:40+00:00","updated_at":"2026-11-10T20:00:40+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:00:40Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows COM+ Event System: local buffer over-read leaks memory contents","impact":"low","summary":"A buffer over-read in the Windows COM+ Event System Service lets an authorized local user read memory beyond the intended buffer. The attacker gets information disclosure only, with no code execution stated in the sources.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","com+"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user reads memory contents beyond a buffer boundary","analyst_note":"Find the Microsoft advisory for CVE-2026-119855 to confirm affected Windows builds and the patch.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-accounts"],"who_is_affected":"Windows machines running the COM+ Event System Service, where a local user already has an account. The sources do not name affected Windows builds or which configurations are exposed, so unknown.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000654,"input_tokens":4489,"output_tokens":410,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119855':15A,18A '-2026':14A,17A 'allow':69C 'attack':46B,72C 'author':36B,71C 'beyond':41B 'buffer':6A,23B,44B,59C 'code':53B 'com':2A,19B,30B,65C 'content':12A 'cve':13A,16A 'disclos':74C 'disclosur':49B 'event':3A,31B,66C 'execut':54B 'get':47B 'inform':48B,75C 'infrastructur':20B 'intend':43B 'leak':10A 'let':34B 'local':5A,37B,76C 'memori':11A,40B 'over-read':7A,24B,60C 'read':9A,26B,39B,62C 'servic':33B,68C 'sourc':58B 'state':55B 'system':4A,32B,67C 'user':38B 'window':1A,21B,29B,64C","nicknames":[],"mitigations":[],"who_affected":"Windows machines running the COM+ Event System Service, where a local user already has an account. The sources do not name affected Windows builds or which configurations are exposed, so unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["com","infrastructure","medium","windows"],"campaign_type":null,"search_a":"'-119855':15A,18A '-2026':14A,17A 'buffer':6A 'com':2A 'content':12A 'cve':13A,16A 'event':3A 'leak':10A 'local':5A 'memori':11A 'over-read':7A 'read':9A 'system':4A 'window':1A","search_b":"'attack':46B 'author':36B 'beyond':41B 'buffer':23B,44B 'code':53B 'com':19B,30B 'disclosur':49B 'event':31B 'execut':54B 'get':47B 'inform':48B 'infrastructur':20B 'intend':43B 'let':34B 'local':37B 'memori':40B 'over-read':24B 'read':26B,39B 'servic':33B 'sourc':58B 'state':55B 'system':32B 'user':38B 'window':21B,29B","search_c":"'allow':69C 'attack':72C 'author':71C 'buffer':59C 'com':65C 'disclos':74C 'event':66C 'inform':75C 'local':76C 'over-read':60C 'read':62C 'servic':68C 'system':67C 'window':64C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:03+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119855","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119855","severity":null,"published_at":"2026-11-10T19:20:03+00:00","modified_at":"2026-11-10T19:20:03+00:00","first_seen_at":"2026-11-10T19:24:59+00:00","fetched_at":"2026-11-10T19:24:59+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}